[Campbell Biology P.654] Which statement accurately describes apicomplexans or their unique ... | Practice Question

Which statement accurately describes apicomplexans or their unique features?

  • A: They are primarily free-living organisms that infect animals opportunistically.
  • B: Their name refers to the apex of the sporozoite cell, which contains organelles for penetrating host cells.
  • C: They are photosynthetic, deriving energy directly from sunlight.
  • D: The apicoplast, a modified plastid, is believed to have originated from a green algal ancestor.

Explanation

Apicomplexans are named because the apex of their sporozoite cell contains a complex of organelles specialized for penetrating host cells and tissues. They are obligate parasites of animals, not free-living, and are not photosynthetic. The apicoplast is a modified plastid of red algal origin.